Fix #1438: Support for precision on GeoPoint mapping

Author: gmarz

Diff for: src/Nest/Domain/Mapping/Descriptors/FieldDataNonStringMappingDescriptor.cs

@@ -33,5 +33,11 @@ public FieldDataNonStringMappingDescriptor Filter(Func<FieldDataFilterDescriptor
 			this.FieldData.Filter = selector.Filter;
 			return this;
 		}
+
+		public FieldDataNonStringMappingDescriptor Precision(double precision, GeoPrecisionUnit unit)
+		{
+			this.FieldData.Precision = new GeoPrecision(precision, unit);
+			return this;
+		}
 	}
 }

Diff for: src/Nest/Domain/Mapping/SubMappings/FieldData/FieldDataNonStringMapping.cs

@@ -11,5 +11,8 @@ public class FieldDataNonStringMapping : FieldDataMapping
 	{
 		[JsonProperty("format")]
 		public FieldDataNonStringFormat? Format { get; set; }
+
+		[JsonProperty("precision")]
+		public GeoPrecision Precision { get; set; }
 	}
 }

Diff for: src/Nest/Enums/FieldDataNonStringFormat.cs

@@ -16,6 +16,8 @@ public enum FieldDataNonStringFormat
 		[EnumMember(Value = "doc_values")]
 		DocValues,
 		[EnumMember(Value = "disabled")]
-		Disabled
+		Disabled,
+		[EnumMember(Value = "compressed")]
+		Compressed
 	}
 }

Diff for: src/Tests/Nest.Tests.Unit/Core/Map/GeoPoint/FielddataSerializes.json

@@ -0,0 +1,13 @@
+{
+  "elasticsearchprojects": {
+    "properties": {
+      "origin": {
+        "type": "geo_point",
+        "fielddata": {
+          "format": "compressed",
+          "precision": "1.0km"
+        }
+      }
+    }
+  }
+}

Diff for: src/Tests/Nest.Tests.Unit/Core/Map/GeoPoint/GeoPointMappingTests.cs

@@ -0,0 +1,32 @@
+using Nest.Tests.MockData.Domain;
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Nest.Tests.Unit.Core.Map.GeoPoint
+{
+	[TestFixture]
+	public class GeoPointMappingTests : BaseJsonTests
+	{
+		[Test]
+		public void FielddataSerializes()
+		{
+			var result = this._client.Map<ElasticsearchProject>(m => m
+				.Properties(ps => ps
+					.GeoPoint(gp => gp
+						.Name(p => p.Origin)
+						.FieldData(fd => fd
+							.Format(FieldDataNonStringFormat.Compressed)
+							.Precision(1, GeoPrecisionUnit.Kilometers)
+						)
+					)
+				)
+			);
+			this.JsonEquals(result.ConnectionStatus.Request, MethodInfo.GetCurrentMethod());
+		}
+	}
+}

Diff for: src/Tests/Nest.Tests.Unit/Nest.Tests.Unit.csproj

@@ -110,6 +110,7 @@
     <Compile Include="Core\Map\CustomMapping\ImagePluginMappingTests.cs" />
     <Compile Include="Core\Map\Enums\EnumMappingTests.cs" />
     <Compile Include="Core\Map\GenericTypes\GenericTypeMappingTests.cs" />
+    <Compile Include="Core\Map\GeoPoint\GeoPointMappingTests.cs" />
     <Compile Include="Core\Map\GeoShape\GeoShapeMappingTests.cs" />
     <Compile Include="Core\Map\GetMappingSerializationTests.cs" />
     <Compile Include="Core\Map\MappingBehaviourTests.cs" />
@@ -190,6 +191,9 @@
     <None Include="Core\Map\GenericTypes\GenericTypeMapping.json">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Include="Core\Map\GeoPoint\FielddataSerializes.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
     <None Include="Core\Map\GeoShape\PrecisionSerializesAsString.json">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>